Joseph stevens



(No Model.)

J. STEVENS..

STEAM BOILER- A 10.294.921 menteamm. 11, 1884,.

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El E B E WHEN gwimmiaum;

y UNITED STATES PATENT OFFICE.

JOSEPH STEVENS, OF SAN FRANCISCO, CALIFORNIA.

STEAM-Bomen.

SPECIFICATION forming part of Letters Patent No. 294,927, dated March 11, 1884.

Application filed December 7, 1883. (No model.)

To all whom, it may concern:

Be it known that I, JosEPI-i STEVENS, of the city andcounty of San Francisco, and State of California, have invented an Improvement in SteainBoilers; and I hereby declare the following to be a full, clear, and exact description thereof.

My inventionvrelates to certain improvements in steam-boilers; and it consists of a lower portion composed of alternate series of horizontal tubes crossing each other at right angles, their ends opening` into vertical water-legs, which form the sides and inclose the grate and nre-space, a combined steam and water drum situated above the tubes, and circulating-pipes connecting this drum with the vertical water-legs 'at top and bottom.

Referring tol the accompanying drawings for a more complete explanation of' my invention, Figure l is a perspective exterior view of myv boiler. Fig. 2 is a vertical section taken longitudinally through the cylindrical portion. Fig. 3 is a horizontal section.

-The lower part of my boiler is shown in the present case square in forni, and consists of water legs or spaces A, which forni the walls.

Near one end is the fire-place and grate B, and the escape pipe or iue C leads out from the opposite end, also near the bottom. A diaphragm, D, extends up to or near the top and across from side to side of the interior space, and this directs the 'Haine and products of combustion upward, and then down upon the opposite side to the escape-flue, so as to produce the greatest heating effect. TubesE extend across the interior space between the ,walls in horizontal rows, their ends opening into the water-spaces A, and other tubes, F, may extend across between the first-named rows and at right angles with them, also open ing into the end water-spaces, so as to produce a complete connection of all parts. Above this portion of the boiler is a cylindrical portion, G, supported by walls, so that the heat passing upward f rom the furnace may act upon its lower side. From the upper part of the water-legs A a steam pipe or pipes, H, connect with the lower part of this cylinder, and circulating-pipes I lead from the bottom of the cylinder to the bottom of the water-spaces A, as shown. Water iills the whole of the square lower part of the boiler, and also'a part of the cylindrical steam-drum G. The steam generated in the lower tubular portion of the boiler passes up into the cylinder along with the water from the upper part of the generator, and the pipes I return it again to the bottom of the part A, thus keeping up a rapid and complete circulation.

In the construction of multitnbular boilers `great difficulty is experienced in preventing the water being driven out of the lower tubes by the rapid ebullition, and the consequent injurious heating of the tubes. This invention is designed to prevent this, and to provide a complete and rapid circulation of the water, which is more effectually done by the combination with the transverse tubes of the cylinder above and the connectingpipes.

Having thus described my invention, what I claim as new,and desire to secure by Letters Patent, is-

In a steam-boiler, he rectangular watcrlegs, with the horizontal pipes uniting the spaces upon opposite sides, the fire-place and chimney situated at the bottom and at opposite end's, and the vertical diaphragm or bridgewall between, in combination with the cylindrical water and steam containing shell situated above and exposed to the heat ofthe furnace, as shown, and the circulating-pipes connecting the water-space of the cylinder with the upper and lower part of the watenlegs,

substantially as herein described.

In witness whereof` I have hereunto set my hand.

. JOSEPH STEVENS. XVitnesses:

H. C. LEE, S. H. NoURsE. 

